Nicolin rhymes with:
sakhalin, sokolin, adrenalin, beguelin, candellin, carolyn, carolyne, eveline, globulin, gwendolyn, hamelin, jacqueline, jessalynn, karolyn, madelin, madeline, margolin, matalin, ritalin, rosalyn, sakhalin, schieffelin, sokolin, ugolin
Nicolin sounds like:
nicklin, nicolina, nicoline, nicolini